package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否完成登录
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();
        log.info("拦截到请求:{}",requestURI);
        /*
        1.获取本次请求的URI
        2.判断本次请求是否需要处理
        3.如果不需要处理放行
        4.若是登录状态，放行
        5.未登录返回未登陆结果
         */
        //请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"

        };
        if(check(requestURI,urls)){
            filterChain.doFilter(request,response);
            return;
        }


        if( request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录");
            Long empId = (Long) request.getSession().getAttribute("employee");
            log.info("用户id为{}",empId);
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }
        //移动端
        if( request.getSession().getAttribute("user")!=null){
            log.info("用户已登录");
            Long userId = (Long) request.getSession().getAttribute("user");
            log.info("用户id为{}",userId);
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        //需要往回写数据,通过输出流向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));


    }

    /**
     * 路径匹配
     * @param requestURI
     * @return
     */
    public boolean check(String requestURI,String[] urls){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
